Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of marketable securities

The following is a summary of our marketable securities as of September 30, 2020 and December 31, 2019 (in thousands):

	September 30, 2020
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Securities maturing within one year:
Corporate debt securities	$	23,861	$	145	$	(1)	$	24,005
Certificates of deposit	14,300		—		—		14,300
Commercial paper	9,488		—		—		9,488
Total securities maturing within one year	$	47,649	$	145	$	(1)	$	47,793
Securities maturing between one and three years:
Corporate debt securities	$	16,809	$	319	$	(2)	$	17,126
U.S. treasury and government agency securities	4,998		—		—		4,998
Certificates of deposit	1,000		—		—		1,000
Total securities maturing between one and three years	$	22,807	$	319	$	(2)	$	23,124
Total marketable securities	$	70,456	$	464	$	(3)	$	70,917

	December 31, 2019
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Securities maturing within one year:
Corporate debt securities	$	46,186	$	140	$	(2)	$	46,324
U.S. treasury and government agency securities	2,750		—		—		2,750
Certificates of deposit	1,500		—		—		1,500
Total securities maturing within one year	$	50,436	$	140	$	(2)	$	50,574
Securities maturing between one and three years:
Corporate debt securities	$	8,016	$	152	$	—	$	8,168
Total securities maturing between one and three years	8,016		152		—		8,168
Total marketable securities	$	58,452	$	292	$	(2)	$	58,742